body{ margin:; padding:;}

 #con{

 position:absolute;

 top:;

 left:;

 height:100%;

 width:100%;

 background-image:url("maskimg/star.jpg");

 background-position: center 0;

 background-repeat: no-repeat;

 background-attachment:fixed;

 background-size: cover;

 -webkit-background-size: cover;/* 兼容Webkit内核浏览器如Chrome和Safari */

 -o-background-size: cover;/* 兼容Opera */

 zoom:;

 }